JSON Formatter
Format, minify and validate JSON with clear error messages.
Runs on your device · no upload
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About JSON Formatter
JSON Formatter pretty-prints, minifies and validates JSON. If the JSON is invalid, you see the exact error. Your data never leaves your browser.
1
Paste your input
Everything runs in your browser. Nothing is sent anywhere.
2
Get the result
Copy it with one tap.
3
Download
Save the result. No watermark, no sign-up.
Frequently asked questions
How do I validate JSON?
Paste it and press Format. Valid JSON is formatted; invalid JSON shows the error.
Can it minify JSON?
Yes. Press Minify to remove whitespace.
Are my files uploaded anywhere?
No. This tool runs in your browser, so your file stays on your device and is never sent to a server.